I did some searching for Java decompilers and came across some strange answers on the big SO questions.
On a 4 year old question, the top answer from 4 years ago has 21 votes. Yet an answer less than a week old, from a user less than 10 days old and linking to a commercial website, has 20 votes!
Similiar answers from other suspect users that I could find are as follows:
They all link to the Secureteam product and have a crazy amount of votes in relation to their posting time.